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Related Experiment Videos

Functional analysis of LHbeta knockout mice.

T Rajendra Kumar1

  • 1Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas, KS 66160, USA. tkumar@kumc.edu

Molecular and Cellular Endocrinology
|March 14, 2007
PubMed
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Mice lacking the luteinizing hormone beta (LHbeta) subunit are infertile with impaired gonadal development and function. These LHbeta null mice offer a model for studying reproductive disorders caused by isolated LH deficiency.

Area of Science:

  • Reproductive Biology
  • Endocrinology
  • Genetics

Background:

  • Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) are critical for gonadal function, regulating steroidogenesis and gametogenesis.
  • Loss of LH function can lead to human reproductive disorders.
  • Understanding LH's specific role requires models that isolate its effects.

Purpose of the Study:

  • To create and characterize a mouse model lacking the LHbeta subunit to study the consequences of isolated LH deficiency.
  • To investigate the role of LH in male and female reproductive development and function.
  • To define LH-responsive genes and pathways affected by LH deficiency.

Main Methods:

  • Generation of LHbeta knockout (null) mice.
  • Assessment of gonadal size, histology, and function in mutant and wild-type mice.

Related Experiment Videos

  • Measurement of serum and intra-testicular hormone levels (testosterone, estradiol, progesterone).
  • Evaluation of spermatogenesis and folliculogenesis.
  • Pharmacological rescue with human chorionic gonadotropin (hCG).

    • Main Results:

    • LHbeta null mice are viable but infertile, exhibiting postnatal defects in gonadal growth and function.
    • Mutant males show reduced testes size, impaired Leydig cell differentiation, and decreased testosterone levels, with spermatogenesis blocked at the round spermatid stage.
    • Mutant females are hypogonadal with lower estradiol and progesterone, defective folliculogenesis, and absent corpora lutea.
    • FSH levels remain unaffected, indicating defects are specific to LH deficiency.
    • Exogenous hCG administration rescues the reproductive defects, confirming retained LH-responsiveness.

    Conclusions:

    • LHbeta null mice serve as a valuable model for studying reproductive disorders resulting from isolated LH deficiency.
    • This model highlights the critical and specific roles of LH in male and female reproductive maturation and function.
    • The study demonstrates that target cells retain LH-responsiveness even in the absence of endogenous LH ligand.